Warp stop-motion for looms.



w. E. GRADWELL.

WARP STOP MOTION FOR LOOIVIS. APPucATnoN man sEPT. 2. 1914` 1,245,705. Patented Nov. 6, 1917'.

4 SHEETS-SHEET l.

w. 5. GRADWELL. WARP STOP MOTION FOR LOOMS.

Patented Nov. 6, 1917.

APPLICATION FILED SEPT. 2.1914. 1,245,705'

lSHEETS-SHEIT 2.

W. E. GRADWELL.

WARP STOP MOTION FOR LOOIVIS.

APPLICATION FILED SEPT2, 1914.

Patented Nov. I5, 1917.'

4 SHEETS-SHEET 3.

W. E. GRADWELL.

wARP STOP MOTION FOR LOOMS.

ATION FILED Patented NOV. 6, 1917.

4 SHEETS-SHEET 4.

JMW/V,

om TED sTATE- s PATENT oFmoE.

WILLIAM EDWINy GRADWLL, or CLAYTON BRIDGE, ENGLAND.

WARP STOP-MOTION FOR LOOIVIS.

.Specication of Letters Patent.

Patented Nov. 6, 1917.

`Implication filed September `2, 1914. Serial No. 859,778.

To allwwm t may concern: v- Y Be it known that I, WILLIAMA yEDWIN GRADWELL, a subject ofthe King of Grreatl Britain and Ireland, and resident of Clay-Y stop motion consists of a number of Vwire drop pins or the like, one for each Warp thread and each preferably similar in shapel to a hair pin. These pins arearranged to lie with their limbs to right and left of a fixed or stationary bar extending across the loom. Below such bar is a further xed or stationary bar separated only fromV theupper bar for a slight distance. In the space thus provided between the fixed bars is a further bar designed to slide to and fro between the fixed bars. This slidingbar at each end engages a slot in a lever arm. Each lever arm is secured to a shaftcommon to both, and, under the partial rotation of such shaft first in one direction and then in the other, the lever arms move `the sliding bar 'to and fro between the jixed bars.

The oscillatory motion is imparted'to Ythe said bar-operating shaft by means `of an eccentric or crank on the loom tappet shaft, and also by means of a connecting rod. and a slip friction coupling on the said bar-operating shaft. In connection with such slip friction coupling is a part which, on the coupling slipping, moves to act upon loomstopping mechanism.

The said drop pins, when the wafrpthreads are intact and at their normal tension, lie with their lower ends slightly above the space in which the sliding bar moves, but as soon as a pin falls, owing to the breaking or undue slackening of a `warp thread, its limbs come into the path of thesliding bar and obstructing such bar cause it to remain stationary. In thus beingheld stationary,

the bar, in turn, holds the lever arms and their' shaft stationary, Vwhereupon the operative part of the slip friction coupling, by continuing to move under the action of the. eccentric on the tappet shaft, causes the coupling to slip, and, through the said part which operates upon the` loom-stopping mechanism, stops the loom.

In restarting the loom after repairing the broken warp and after the pin is vagain held clear of the sliding bar, the parts of` the slip friction coupling resume their normal 'relative positions with the nextoscillation ofthe shaft, when the sliding bar again moves to and fro. For looms weaving a large number of ends, there will be two or. more sets of stationary bars, and twoy or more sliding bars. f

Upon the accompanying drawings,

Figure l illustrates` a front elevation,V

partly broken away, v

Fig. 2 a longitudinal sectional elevation on line *m (see Fig. 3). Y

Fig. 3 a top plan, and f Fig. ,4 a further plan on line y-y (see Fig. 2), l

Fig. 5 a transverse sectional elevation onv line e-e (see Fig.v l), and Y Fig. 6 a left hand end elevation of one example of the improved loom warp stop motion', there being four pairs ofstationary bars and two sliding bars. Y

Fig. 7 illustrates a sideelevation of the loom stop mechanism, and, in conjunction with Fig. 5, illustrates the connectiony between such mechanism and the-slip friction coupling'.

Fig. 8 illustrates a side sectional.elevation-v of the slip-friction coupling shown in Figs.

Fig. 9 illustrates a front elevation of further modification of the slip friction cou-v pling.

Fig l0 illustrates one of the pins.

Referring to Figs. l and 2 of the drawings, a, a are the fixed orvstationa'ry upper bars, and o, o are the fixed or stationary lower bars, while c, c are the Sliding bars. The bars a, a, o, o are almost equal in length tothe width of the loom and at their ends are warp i drop supported by brackets (Z, (Z2, (Z3, the brackets (Z, (Z3 being preferably in two parts to alloT of adjustment to suit the width of loom.

he bars a, a, b, are spaced apart at each end by lugs e, e2 formed in one with transverse members e3, e4 respectively, the transverse members c4 being formed in one with the brackets (Z2, (Z3, see Figs. 2 and 5. rlhe sliding bars c, c are joined by crosspieces c in one with each Vof Which is a pin c2. In said brackets cZ, (Z2 (Z3 is journaled the shaft f, and -upon such shaft are secured the lever arms g and g2, the latter being slotted (see Fig. G) and comparatively small and free to move to and fro within a recess in the members e3, e* atthe right hand end of the apparatus, While the former is comparatively large and hollow, see Figs. 2 and 8. The lever arm g2 by its slot, and the lever arm g by means of a groove g3 in one side engage the pins c2 on the cross-pieces of the sliding bars. Loose uponv the shaft j and lying bet-Ween the hollow boss of the lever arm g is a further lever arm ZL, see Figs. Q and 8. In thel periphery of the boss of such lever arm Zi is a curved orsegmental recess ZL, while normally pressing into such recess is a Wheel i carried by a spindle. This spindle projects at its free end through a hole in the end of the lever arm, and betWeen the end of the lever arm and a shoulder on the spindle is a spring j, Which yieldingly holds the Wheel t' in frictional contact With the lever arm boss, the contact being such that, with nothing to obstruct the movements of the lever arms g, g2, they and the bars e, c are moved to and fro wheny the lever arm ZL oseillates. rIhe said lever arm It is connected by rod 70, see Fig. 5, With the eccentric Z on the loom tappet shaft m, Which latter, When in motion, affords a continuous oscillatory motion to the lever arm ZL.

rhc brackets (Z1, (Z2 are preferably joined to each other at their lower parts by side pieces (Zt, Which serve to inclose the lever arm g, see Figs. l and al.. The brackets Z2 and (Z3 are formed With extensions (Z5, in Which are supported rails CZ forsupporting the varp fore and aft of the bars a, a, see Fig.

Placed loosely on each Warp thread is a drop pin n similar in shape to a hair pin, see Fig. 10. Each drop pin lies with its limbs to right and left of the bars a, a above the level of the plates c, c, see Fig,

To the bracket Z2 is pivotally connected a lever 0 Which at its free end rests upon the bracket (Z, see Fig. 2, and at a point in its length over-lies the projecting end of the spindle j in the lever arm g, see, Fig. Q.

it its free end the lever is connected b v aWire or cord j?, passing around pulleys p on the loom frame, with the loom stop mechanism, see Figs. 2, 5 and 7. The loom stop mechanism may be of any suitable kind but consists preferably of a Weighted lever Q, carried pivotally and pendulously from a bracket r, adjustably secured to the loom stopping and starting lever s.

Zhen the loom is in motion and the Warps intact, the lever g assumes, the position shown in full lines, z'. e., with the end of its shorter arm below the shoulder s on the bracket r, but on the cord` y) being pulled, the lever g assumes the position shown in broken lines. In such position the Weighted end of the lever g lies inthe path of the loom slay, (Z8, and on being` struck by the slay during its neXtforward movement, the lever rj serves to release the lever s from its rctaining catch .which thereupon moves in the usual iayto stop, the loom. On again starting the loom, the lever' Q by the jar of the lever s, automatically loses its abutment with the shoulders and resumes the full line` position.

The widths of the bars c, c and their motion are such that both limbs `of the pins n must drop before they4 canhave any effect on the bars c, c.

Assuming the drop pins n to he in positionen the warp threads and the loom in motion, the eccentric Z on the tappet shaft m imparts a rocking .motion to theleve arm Zz. which in turny rocks the shaft through the lever arm g and spring-pressed W ieel The bars c, c are normally oscillated by the arm y. but immediately` a Warp thread breaks its pin .n is dropped to form a bridge between the two. respective stationary bars (t, Zi thereby. constituting an obstruction. in the path of the sliding bars f', c and arresting the motion of the same. The motion of the arm g and consequently of the shaft is simultaneously arrested, Which causes the Wheel e', to rideup the cam surface Zt carrying with it the plunger j. The latter is projected againstthe lever 0. so as to swing it about its pivot, the free end of said lever ex erting a pull on the cablel y) Which is transmitted to the member y so as to raise it into position te engage/the loom .slay as before described.

Referring to. Fig. 9, the slip friction coupling therein shown consists of the two collars fu, e2, one fast and the other loose on the shaft fand thev adjoining ends of the collars being inclined to the shaft f and being held in frictional contact by a spring fC Upon a warp .breaking and a pin n arresting the motion of the bars c, c and the lever arms g3, the continued motion of the collar r2 by the eccentric Z serves to cause the collar e", owing to the inclined faces, to move endWise, and operate upon, the lever u2 and through such lever and a. Wire or cord j? actuate the loom stopping mechanism. VAs in the case of the lever u in Fig. 9, the lever u2 may normally rest against a stop a3 to avoid contact with the collar o2 when not being operated thereby. c

The bars o, Z) may be dispensed with but to prevent risk of the drop pins being bent it is preferred to use the bars Z), b.

To allow of the drop pins being easily handled and also readily seen when dropped, they may each have an extension slightly bent outward at its top end. And to facilitate making the extension, the drop pin may be formed by bending the wire of one limb back upon itself and upward above the fork, see Fig. 10.

That I claim is l. A warp stop motion for looms comprising, in combination, drop-pins or detectors of hair-pin formation, upper and lower bars connected to rigid supports, intermediate reciprocating bars slidably mounted on said supports, a rock shaft also mounted on said supports and having a lever arm loosely mounted thereon, means to oscillate said arm, cam surfaces on the boss of said oscillatory arm to impart the oscillatory movement thereof, through spring-pressed means, to the rock shaft, which in turn imparts movement to the reciprocating bars, means to communicate the motion due to the relative displacement of the boss and rock shaft connection, due to the cam surfaces, to the loom stop mechanism, substantially as described.

2. A warp stop motion constituting a self-A contained fitt-ing, comprising, in combination, end brackets to which are secured a series of upper and lower stationary bars, and bars arranged fore and aft to support the warp threads, upon which are wire detectors, a series of intermediate reciprocating bars slidably mounted on said brackets, a rock shaft also mounted on the brackets with crank arms interconnected with the reciprocating bars, a slip-friction coupling comprising angularly fixed parts on the rocking shaft and a rocking lever having cam faces to engage said angularly xed parts, means to impart the relative motion of the slipfriction coupling members to the loom stop mechanism, substantially as described 3. A warp stop motion, comprising, in combination, end brackets to which are secured upper and lower bars, intermediate reciprocating bars sliding on said brackets, drop-pins supported above said bars, means for transmitting motion to the movable bars, said means comprising a rock shaft mounted in the brackets, lever arms fast on said shaft and engaging the ends of the movable bars; a lever arm loose on the shaft and having a boss with a recess in its periphery, a springpressed spindle capable of radial movement relative to the shaft, one end of which enters said recess-in the" boss to normally.I couple the lever arm to the rock shaft, while the other end lies clear of a second lever pivoted to a fixed part of the machine, said spindle being adapted to ride upthe recess in the boss of the lever arm when the reciprocating bars are arrested, so that the'opposite end of said spindle actuates thesecond lever, means to impart the'movement of the second lever to the loom stop motion, and means to oscillate the lever arm, substantially asdescribed.

4. A warp stop motion for looms having drop pins of hair pin formation, a series of pairs of stationary bars, means for rigidly positioning said bars, one -bar of each pair yeing supported at a slightV distance below the other bar, intermediate bars movable in a straight path and supported on the supports for the stationary bars, all the bars being positioned so that the drop pins, when supported by the warp threads, lie across said bars and normally above the level of the movable bars, means for supporting the warp threads fore and aft of the bars, means for transmitting motion to the movable bars, said means comprising a shaft mounted in the same supports which support the bars, a slotted lever arm fast on such shaft and engaging one end of the movable bars, a further and hollow lever arm with grooves in one face engaging the other end of the movable bars, a lever arm loose on the shaft, having a boss with a segmental recess in its periphery, a spindle within the hollow lever arm, a wheel carried by said spindle and a spring whereby the wheel yieldingly engages the recess in the said boss, the said hollow lever arm having a hole in 'its free end through which the said spindle projects, an eccentric on said loom shaft, and a rod connecting the eccentric to the lever arm having a recessed boss, a lever arm pivoted to one of the supports of the bars and overlying the end of the hollow lever arm and means for supporting the free end of such lever arm normally clear of the spindle, a further lever connected to such lever arm and adapted to be moved into and out of the path of the slay thereby, substantially as described.

5. A warp stop motion for looms, comprising in combination, upper and lower bars connected to rigid supports and over which pass the warp threads, having thereon drop pins or detectors of hair-pin formation, intermediate reciprocating bars slidably mounted on said supports, a rock shaft also mounted on said supports and having a lever arm loosely mounted thereon, means to oscillate said arm, cam surfaces on the boss of said oscillatory arm to impart the oscillatory movement thereof, through spring-pressed means, to the rock shaft, which in t-urn imparts movement to the reciprocating bars, a

lever pivoted to one of the supports of the bars a nd overlying the level' arm on the rock shaft and adapted to be actuated by the relative movement of the aforesaid oscillatory aim and Springqbressed means, loom start-ing and Stopping mechanism and means between the free end of said arm and Said mechanism whereby on the lever being raised, the loom stopping mechanism is moved into a posi- VILLIAM EDVIN GR ADVELL.

lfv'vitnesses FRED J. MEREDITH, HENRY JUNCA.

Gopes of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

